Special markers in plot within range

I'm working on a plot, with data on the y axis between 900 and 1100. I want the markers to be colored if they are in another range ([400, 800]) . Is it possible? If it is, then how?

Answer 1

[Image Analyst]

Try plotting over the plot

indexes = y >= 400 & y <= 800;
% First just plot everything as blue stars with lines in between
plot(x, y, 'b*-');
% Now overplot data points in the range with a red spot.
hold on;
plot(x(indexes), y(indexes), 'r.', 'MarkerSize', 30);

Answer 2

[Star Strider]

It is certainly possible, and likely straightforward. It would help if you are a bit clearer on what you want.

Does your plot go from 400 to 1100 on the y-scale, and you only want data in the range of 400 to 800 to have colored markers?

Is it 2D or 3D?

See if this does what you want:

x = 1:50;                                       % Create X Data
y = randi([400  1100], 1, 50);                  % Create Y Data
select = (y >= 400) & (y <= 800);               % Select Subset

figure(1)
plot(x(~select), y(~select), 'pk')
hold on
plot(x(select), y(select), 'pg', 'MarkerFaceColor','g')
hold off

The ‘select’ assignment is a logical vector with 1 or true corresponding to the y-values that meet the criteria, and 0 or false for the others. The tilde ‘~’ here operates as a negation operator, turning the 1 values to 0 and 0 to 1. It makes the code much easier to write.